/*
 * Copyright ${inceptionYear} - ${year} ${owner}
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package jetbrains.exodus.kotlin

import kotlin.reflect.KProperty

val <T> T?.notNull: T get() = this ?: throw IllegalStateException()

fun <T> T?.notNull(msg: () -> Any?) = this ?: throw IllegalStateException(msg().toString())

inline fun <T : Any, R> T.synchronized(block: T.() -> R): R = synchronized(this) {
    return block()
}

class DefaultDelegate<T>(private val getDefault: () -> T) {

    private var value: T? = null

    operator fun getValue(thisRef: Any?, property: KProperty<*>): T {
        return value ?: getDefault().also { value = it }
    }

    operator fun setValue(thisRef: Any?, property: KProperty<*>, value: T) {
        this.value = value
    }
}